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2. File:Tell-time-clock-hour-chart-at-coloring-pages-for-kids ...

   en.wikipedia.org/wiki/File:Tell-time-clock-hour...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

3. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   Devices and methods for keeping time have gradually improved through a series of new inventions, starting with measuring time by continuous processes, such as the flow of liquid in water clocks, to mechanical clocks, and eventually repetitive, oscillatory processes, such as the swing of pendulums. Oscillating timekeepers are used in modern ...

4. Time clock - Wikipedia

   en.wikipedia.org/wiki/Time_clock

   Electronic time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card

5. Roman timekeeping - Wikipedia

   en.wikipedia.org/wiki/Roman_timekeeping

   An hour was defined as one twelfth of the daytime, or the time elapsed between sunset and sunrise. Since the duration varied with the seasons, this also meant that the length of the hour changed. Winter days being shorter, the hours were correspondingly shorter and longer in summer. [1]

6. Chronometry - Wikipedia

   en.wikipedia.org/wiki/Chronometry

   Time metrology or time and frequency metrology is the application of metrology for timekeeping, including frequency stability. [ 28 ] [ 29 ] Its main tasks are the realization of the second as the SI unit of measurement for time and the establishment of time standards and frequency standards as well as their dissemination .

7. History of timekeeping devices in Egypt - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping...

   Shadow clocks were modified sundials that allowed for greater precision in determining the time of day, and were first used around 1500 BCE. [1] Their major innovation was a modified, more precise gnomon that allowed for the division of night time into 50 parts, with an additional two "twilight hours" in the morning and evening. The shadow ...